These are the proprietary binary-only i386-only
libraries for EPSON USB scanners. The libraries
are provided (in object code form only) under the
terms of the license agreement provided in the
EAPL and LICENSE files in the directory
/usr/doc/iscan-proprietary-drivers/

The proprietary libraries used by the driver 
epkowa are only needed for the following scanners:

libesint1F: Perfection 1250 / Perfection 1250 
            PHOTO / GT-7200

libesint23: Perfection 1260 / Perfection 1260 
            PHOTO / GT-7300

libesint32: Perfection 3170 PHOTO / GT-9400

libesint41: Perfection 2480 PHOTO / GT-F500, 
            Perfection 2580 PHOTO / GT-F550

libesint43: Perfection 4180 PHOTO / GT-F600

libesint52: Perfection 3490 PHOTO / GT-F520, 
            Perfection 3590 PHOTO / GT-F570

libesint54: Perfection 4490 PHOTO / GT-X750

libesint66: Perfection V10 / GT-S600, 
            Perfection V100 PHOTO / GT-F650

libesint68: Perfection V350 PHOTO / GT-F700

libesint7A: Perfection V200 PHOTO / GT-F670

libesint7E: Stylus CX4300, Stylus CX4400,
            Stylus CX5500, Stylus CX5600,
            Stylus DX4400

Additionally proprietary firmware files are 
only needed for the following scanners:

esfw41.bin: Perfection 2480 PHOTO / GT-F500, 
            Perfection 2580 PHOTO / GT-F550

esfw32.bin: Perfection 3170 PHOTO / GT-9400UF

esfw52.bin: Perfection 3490 PHOTO / GT-F520, 
            Perfection 3590 PHOTO / GT-F570

esfw43.bin: Perfection 4180 PHOTO / GT-F600

esfw54.bin: Perfection 4490 PHOTO / GT-X750

esfw66.bin: Perfection V10 / GT-S600, 
            Perfection V100 PHOTO / GT-F650

esfw68.bin: Perfection V350 PHOTO / GT-F700

esfw7A.bin: Perfection V200 PHOTO / GT-F670

The firmware files are provided in the package 
iscan-firmware.